Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quantas temporadas Pat Chambers treinou?
 ###Tabelas: CREATE TABLE supply-demand_gap (supply-demand_gap_id AUTO_INCREMENT PRIMARY KEY, Country VARCHAR, Uranium required 2006-08 VARCHAR, % of world demand VARCHAR, Indigenous mining production 2006 VARCHAR, Deficit (-surplus) VARCHAR) CREATE TABLE coaching_history (coaching_history_id AUTO_INCREMENT PRIMARY KEY, Coach VARCHAR, Years VARCHAR, Seasons INT, Record VARCHAR, Pct. INT, Nat. Titles INT) CREATE TABLE belmont_stakes_feature_key_prep_races_list (belmont_stakes_feature_key_prep_races_list_id AUTO_INCREMENT PRIMARY KEY, Date VARCHAR, Track VARCHAR, Race VARCHAR, Distance VARCHAR, Surface track VARCHAR, Winning horse VARCHAR, Winning jockey VARCHAR) CREATE TABLE grand_slam_timeline (grand_slam_timeline_id AUTO_INCREMENT PRIMARY KEY, Tournament VARCHAR, 2003 VARCHAR, 2004 VARCHAR, 2005 VARCHAR, 2006 VARCHAR, 2007 VARCHAR, 2008 VARCHAR, 2009 VARCHAR, 2010 VARCHAR, 2011 VARCHAR, 2012 VARCHAR, Win % VARCHAR) CREATE TABLE head_to_head_record (head_to_head_record_id AUTO_INCREMENT PRIMARY KEY, Competition VARCHAR, Played INT, Spartak INT, Draw INT, Dynamo INT)  
SELECT COUNT Seasons FROM coaching_history WHERE Coach = pat chambers